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I have an &[u8] and would like to turn it into an &[u8; 3] without copying. It should reference the original array. How can I do this?
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The basic difference between a slice and an array is that a slice is a reference to a contiguous segment of an array. Unlike an array, which is a value-type, slice is a reference type. A slice can be a complete array or a part of an array, indicated by the start and end index.
To create a new vector from a slice: slice. to_vec();
creating a slice using make func make([]T, len, cap) []T can be used to create a slice by passing the type, length and capacity. The capacity parameter is optional and defaults to the length. The make function creates an array and returns a slice reference to it.
Common examples of array slicing are extracting a substring from a string of characters, the "ell" in "hello", extracting a row or column from a two-dimensional array, or extracting a vector from a matrix. Depending on the programming language, an array slice can be made out of non-consecutive elements.
As of Rust 1.34, you can use TryFrom / TryInto:
use std::convert::TryFrom;
fn example(slice: &[u8]) {
let array = <&[u8; 3]>::try_from(slice);
println!("{:?}", array);
}
fn example_mut(slice: &mut [u8]) {
let array = <&mut [u8; 3]>::try_from(slice);
println!("{:?}", array);
}
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